You are Here: Home >< Maths

# Probability question watch

1. Assuming a group of 35 users, with each user active for 10% of the time, what is the probability that at least 11 or more are active?
2. (Original post by Balgo)
Assuming a group of 35 users, with each user active for 10% of the time, what is the probability that at least 11 or more are active?
set up a binomial model with
X = no of active users

number of trials n =35
probability of being active p = 0.1

Use tables to find P(X>=11)

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: January 9, 2015
Today on TSR

### Congratulations to Harry and Meghan!

But did you bother to watch?

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams